Chemistry - December 2006

please help

2006-12-01 05:57:49 · 1 answers · asked by Anonymous

2006-12-01 05:23:52 · 5 answers · asked by fa d 1

the FeSCN 2+ in an equilibrium mixture. Explain....

Add / Increases FeSCN2+ / Decreases FeSCN2+/ Reason
Fe3+
Heat
Cl-
Cooling

2006-12-01 04:50:03 · 2 answers · asked by chemistrymagic 1

The emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (Lyman series) in the visible (Balmer series) and in the infrared (Paschen series, Brackett series, etc.) regions of the spectrum.


(a) What feature of the electronic energies of the hydrogen atom explains why the emission spectrum consists of discrete wavelength rather than a continuum wavelength?


(b) Account for the existence of several series of lines in the spectrum. What quantity distinguishes one series of lines from another?


(c) Draw an electronic energy level diagram for the hydrogen atom and indicate on it the transition corresponding to the line of lowest frequency in the Balmer series.


(d) What is the difference between an emission spectrum and an absorption spectrum? Explain why the absorption spectrum of atomic hydrogen at room temperature has only the lines of the Lyman series.

2006-12-01 04:47:12 · 2 answers · asked by bosox1989 1

OK, we are told that polonium poisoning can only happen if we eat it or breathe it. Suppose we do receive a minute dosage. Does this mean that if we have no symptoms and no problem for a reasonable amount of time we are fine, or can it cause long term problems to health, like cancer, etc? What about pregnant women? I mean OK, it is obviously unlikely that we have all been poisoned on the BA planes and that we will die like Litvinenko, but what about minor-minor exposure, can't that do any harm in the long run? Is it you are either poisoned or you are not and have escaped it, or can it affect you secretely, with no symprtoms?

2006-12-01 04:12:06 · 4 answers · asked by cpinatsi 7

2006-12-01 04:09:31 · 4 answers · asked by asianchoc 1

how do you determine polarity, and what is the answer to this?

Which of the following molecules is most polar?

a. Cl2
b. HCl
c. NO
d. IBr
e. H2

2006-12-01 03:55:13 · 3 answers · asked by Anonymous

what happens when NaF reacts with AgNO3 and with Pb(NO3)2
What happens KCl reacts with AgNO3 and with Pb(NO3)2
What happens when KBr and KI also both react with those same two reagents
colors and names of precipatates would help
Thanks A Lot

2006-12-01 03:53:18 · 2 answers · asked by Anonymous

2006-12-01 03:40:23 · 20 answers · asked by Anonymous

Is there any way of determining this answer? (like a trend on the table or just how would you do it?

If KBr, C2H5OH, C2H6, and He are arranged in order of increasing boiling point, the list is
a. He < C2H5OH < C2H6 < KBr
b. KBr < C2H6 < C2H5OH < He
c. He < C2H6 < C2H5OH < KBr
d. KBr < C2H6 < He < C2H5OH
e. C2H5OH < C2H6 < He < KBr

2006-12-01 03:38:49 · 5 answers · asked by Anonymous

2006-12-01 03:35:09 · 1 answers · asked by whawkeyes06 2

For some preparations say some double stage preparations, What purpose we are adding this.

2006-12-01 03:32:11 · 1 answers · asked by Srinivasan N 1

2006-12-01 03:23:40 · 2 answers · asked by Anonymous

please help me solve that

2006-12-01 03:21:47 · 2 answers · asked by amanda j 1

2006-12-01 03:21:17 · 4 answers · asked by Anonymous

We have a reverse osmosis water purification system that seems to lower the pH, even with correction cartidges. This apparently leeches copper from the hosehold pipes. Copper has been measured up to 1.6ppm. Does this mean the copper pipes will corrode right through some day? How long?

2006-12-01 03:03:19 · 2 answers · asked by Anonymous

2006-12-01 02:37:47 · 3 answers · asked by Anonymous

2006-12-01 02:35:35 · 4 answers · asked by Mouth 1

2006-12-01 02:34:03 · 1 answers · asked by whawkeyes06 2

2006-12-01 02:23:31 · 5 answers · asked by Angel Eve 6

Help me with another science fair project so that I can make something of my life when I get older! Please and thank you!

2006-12-01 02:01:23 · 5 answers · asked by Anonymous

Assuming that the astmostpheric pressure is 780 torr, what would be the height of a barometer based on dibutylphthalate? in m

2006-12-01 02:00:38 · 2 answers · asked by lsubetty 2

a)al+h2so4>al2(so4)3+h2

2006-12-01 01:53:27 · 3 answers · asked by Vince P 1

I need it, and would rather not order it online.

thanks.

2006-12-01 01:07:29 · 2 answers · asked by Captain Morgan 2

2006-12-01 01:07:00 · 1 answers · asked by Anonymous

Which of the following statements are true for the reaction


Ca(OH)2(aq) + HCl(aq) -->




a) Water is a product

b) When balanced the coefficient of Ca(OH)2(aq) is 1

c) Ions cannot appear in the net ionic equation because they always cancel out on both sides of the equation

d) H+(aq) appears in the net ionic equation

e) Cl -(aq) appears in the net ionic equation



Examples of species are (aq) (s) (l) etc.

2006-12-01 00:34:22 · 5 answers · asked by Anonymous